Helical strain relief device



FIG. 1 is a top left perspective view of a helical strain relief device.

FIG. 2 is a front elevation view of the helical strain relief device.

FIG. 3 is a back elevation view of the helical strain relief device.

FIG. 4 is a right elevation view of the helical strain relief device.

FIG. 5 is a left elevation view of the helical strain relief device.

FIG. 6 is a top plan view of the helical strain relief device; and,

FIG. 7 is a bottom plan view of the helical strain relief device.

The broken lines shown represent the portions of the helical strain relief device that form no part of the claimed design. 

CLAIM The ornamental design for a helical strain relief device, as shown and described. 